CFG Services, making geothermics simple. A subsidiary of the BRGM.

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Corrosion

CFG Services can provide a very early diagnosis of corrosion problems and ensure the long life of your facilities thanks to a multidisciplinary team of corrosion specialists (chemists, microbiologists, geochemists) equipped with portable means of intervention and in-situ measurements. Backed by 20 years’ experience, this team has carried out interventions in a wide range of fields: chemical industry, oil industry, oil services industry, water circuits (drinking water, industrial water, seawater), drinking water and industrial water boreholes, geothermal operations, spa centres, underground storage.

Corrosion

Assessing the source of the corrosion on carbon steel heat exchanger tubes supplied with groundwater (2012)

Goal : to determine the source of the soiling and significant penetrations in the carbon steel tubes of a series of heat exchangers and offer corrective actions

  • Audit of the cooling circuit supplied with groundwater : history of the operating conditions, analysis of the industrial process, observation of the damage
  • Measuring physical and chemical parameters and taking samples of the water and deposits
  • Chemical analysis of the cooling water : major anions and cations, trace elements, total sulphides, dissolved and total iron
  • Bacteriological analysis of the cooling water : iron bacteria, sulphate-reducing bacteria (SRB) and thiosulphate-reducing bacteria (TRB)
  • Chemical, mineralogical and bacteriological analysis of the deposits
  • Chemical stripping of a heat exchanger tube sample
  • Proposal for optimising the operating conditions so as to prevent the development of bacterial microflora and limit the corrosion-erosion phenomena
  • Recommendations for a bactericidal treatment
  • Proposal for an instrument to measure biocorrosion: CFG MIC SENSOR®

Photo caption: Iron-cycle filamentous bacteria responsible for clogging up the heat exchangers

Analysis of the corrosion risk in the geothermal circuit of an EGS-type power plant

Goal : to develop a corrosion risk matrix in order to adapt the operating conditions and also preventive treatment and monitoring solutions in an EGS (Enhanced Geothermal System) type of geothermal power plant.

  • Inventory of the different forms of corrosion and parameters controlling them
  • Analysis of the corrosion risks based on chemical data, operating conditions, the nature of the materials (and coatings, if any), the summary of results from previous studies, observations and measurements made in situ
  • Developing the corrosion risk matrices and diagram

Study into the corrosion and deposit phenomena in the double flash geothermal circuits for producing electricity (2010)

Goal: to develop corrosion and deposit risk matrices so as to identify the life span of the facilities and define the manufacturer's warranties.

  • Studying the parameters controlling corrosion and inventory of the different forms of corrosion in geothermal plants for the production of energy
  • Matrix and diagram of the corrosion risks for the metal materials of the circuits and equipment of a double flash geothermal plant
  • Studying the geochemical deposit phenomena according to the physical and chemical characteristics of the geothermal fluids. Modelling the deposit phenomena

Technical audit of the corrosion problems observed on a single flash geothermal steam turbine (2009)

Goal : to record the problems linked to corrosion phenomena and understand their sources in order to provide technical support to the contracting authority in the context of a damage claim made to the insurers.

  • Recording the problems linked to corrosion on the rotor and stator of a single flash turbine
  • Analysing the source of the problems
  • Drawing up a maintenance plan
  • Technical assistance to the contracting authority in the context of a damage claim with the insurance companies

Study into the risk of deposit formation by cooling in thermal water (2006)

Goal: to identify, by means of a geochemical model, the risk of deposits through the thermal water cooling from 53°C to 36°C.

  • Measuring physical and chemical parameters and taking samples of the thermal water
  • Chemical analysis of the thermal water: major anions and cations, dissolved sulphides, dissolved and total iron
  • Bacteriological analysis of the thermal water: iron bacteria, sulphate-reducing bacteria (SRB) and thiosulphate-reducing bacteria (TRB)
  • Analysis of the gaseous fraction: gas/liquid ratio (GLR), analysis of the free and dissolved gases
  • Study into the risk of deposit formation by geochemical modelling using the SOLMINEQ system

Audit of the facilities at a geothermal plant for the production of electricity and feasibility study for putting buried and immersed facilities under cathodic protection (2005)

Goal : to put implement an action plan for combating corrosion problems and assist the geothermal plant's contracting authority to search for and select a technical solution for putting equipment under cathodic protection.

Corrosion audit:
  • Inventory and analysis of the problems linked to corrosion for all the geothermal plant's equipment
  • Drawing up an action plan to combat corrosion and ensure the long life of the equipment
Cathodic protection:
  • Drawing up the specifications for putting the facility under cathodic protection
  • Search for service providers
  • Analysing bids
  • Recommendations to the contracting authority

Assessing corrosion for the cooling circuit of a household waste incineration plant in Lisbon (1999)

Goal: to identify the source of localised corrosion and pitting on a cooling circuit after 6 months in operation.

  • Physical and chemical analyses of the water supplying the cooling circuit
  • Chemical analysis of the circuit water: suspended solids, CAT, major anions and cations, dissolved sulphides, dissolved and total iron
  • Bacteriological analysis of the circuit water: sulphate-reducing bacteria (SRB) and thiosulphate-reducing bacteria (TRB)
  • Recommendations concerning the chemical treatment to be implemented

November 2017

GLOBAL GEOTHERMAL ENERGY SUMMIT 2017

CFG Services will be present in Amsterdam for the 5th Global Geothermal Energy Summit (29th-30th November). You can contact our delegate Erwan Bourdon, International Business Manager,…

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Tel. 33(0)2 38 64 31 22 - Fax 33(0)2 38 64 32 83